tl;dr: Episodes without Kaoru and Michiru = average. Episodes with Kaoru and Michiru = good.
I found the story was too slow paced with little happening and not interesting enough. Apart from Kaoru and Michiru of course, their part of the story was the best. Unfortunately it doesn't focus on them all of the time. Precure stories aren't the fastest pasted in anime, but this series seemed especially slow and dull compared to others. The main story itself is generic - a big bad guy with various minions trying to destroy the universe/worlds. There's only one plot twist right at the end. I feel other Precure series handled this better, especially Fresh.
I also felt like there was too much filler which wasn't the most entertaining. I think how there are only two main girls lets the filler down as there is only so much you can do with 49 episodes of the same two characters all the time. The filler wasn't up to the standard of other series.
The animation was pretty bad. Lots of derpy faces and poor drawings, but what can you expect.
The designs themselves are awful. Again, apart from Michiru and Kaoru. I really liked Michiru's as she reminds me of Will from W.I.T.C.H.
Saki and Mai character wise are a bit different from Nagisa and Honoka, but that doesn't stop them from looking like poorly done rip off fan designs. The first outfits you can put up with, Saki's second outfit however is terrible! The colour is greeny-yellow! Who thought that looked good!?
Another thing I disliked was that Saki and Mai just got beat up most of the time instead of getting stronger until the last few episodes. In other series the Cures actually get evidently stronger and beat enimies faster as time goes on. Saki and Mai just get punched down until the last moment of a fight when they fire their main big finishing attack. The fight scenes lacked compared to other series, but they seemed to be stronger cures in terms of their magical powers, they just didn’t use their fists enough.
The writing is very good. No main character gets more unnecessary screen time than another.
The characters themselves are good. I liked all of the fairies, Saki and Mai are likable (far from my favourite Cures though). The first villan is kind of dull and I hated Moerumba he was so annoying. I liked the rest of the villains. Ms. Shitataare is the best, she was really entertaining and added in good comedy. The series itself did make me laugh quite a few times.
Kaoru and Michiru however are by far the best characters, their development is wonderful and they are really interesting. I like them a lot more than Saki and Mai.
I know this review seems pretty negative, but this isn't a bad show itself. I just found the other Precure series I have watched to be better. (and no I haven't seen Doki Doki!)
